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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5532a5424909691a223c7cda6cc39ea08b2d47dd246deebbd310315b650e55ee' 
  AND token = '4cBDFvwvKJVAwZ/aeouvb6lj34C+c5qfiYxH+oO+3xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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