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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b692d9a355d16cd2dfc9f397ed79dd5fb6e520b0b3754f39286d5e976607ff22' 
  AND token = 'vAkZQxKyX/mc+6u7N3S57IPzpid42nLLwh2BUPBwwoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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