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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f217b2a6700dc8515ace7289806aed0b370aab526245374f7c00582e047cb6' 
  AND token = 'Vs77zjUqhStcfDAWC0spnFPyFY9DG06rnPlmI6LxP7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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