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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0cd2304cbcaead6c1392de838700c6df8edf23e0ba94da95959f6414ba1c46e' 
  AND token = 'jBnol1WnxlPP/NK2ehNdf0WMp1ThOcaA9uFe5mxD+fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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