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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '268f06af2e65b7a60d77b96c113b2e3a1a383683a7f21d73cfed0ce418235eaf' 
  AND token = 'waLrIuEezmsaM2LIXKxS4+G6oDStvEluHfN9JHz4c3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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