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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc3c5519c4a3144e71021a700610cf2fb3d17ea0f804e1a470f012d98ac92fa' 
  AND token = 'yILDyg1lQCcOzjxhUjSxyc2nlUszm7bEh0Om9ZIfiW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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