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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbae69598e842347da6a9971c9bd8a0b94752701ad8e61e8ac1731852cae6148' 
  AND token = 'cn4c/Rk3l7K4B2VTcH/wu+FJkCO0NXOyB+zryyYO97Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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