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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cabbd1f6f45fbea4090a4aef8549be9f5bf5705878958c6002acb0b1c6541bec' 
  AND token = 'e198/Kq7IgqCohk67yEMHfKVMcJsdQgLNi5WAA3Yns4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}