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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5631815db1a63acc08b5510ab40db3f1a2b25af6647d220303e615d58059fa5a' 
  AND token = 'aNl17eYbFpgQZZ59wEjePH+yip9xOKUU5qLE5pFEiFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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