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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7af1b78d370cadaea39cf5b1baf82dc41a1a491a69618b8c2c9d96b5514ac7bd' 
  AND token = 't7bhJgFalLM1Bn3qJHmhYbVJirN8zyUzpG5EmrrCIIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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