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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '886b24089af47e655d49ad5b4d66784e53d214cadc6df41f4c242c9d8ee61f36' 
  AND token = 'hhTbnSEyepL+bbbUnZ22UDKZbwvoxaBXvr39yHIH7Rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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