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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '143e2f7a845470f3c7d9b406083b96a16ab93f281cfd72fd2195cc3a3c9639d5' 
  AND token = '7tYXXFOLKLEVCSJ1t6FA4dW0OvphElZPZPdmxua1Qps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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