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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e3c30e77b169c3c6f3a725a6255ddd2694c776d7c2646ceb85f18ec7cff04d0' 
  AND token = '7v2M6TlIgdo6Dac7q/KEHMBLtCZM7NZ2cJ9JeO+IU6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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