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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc5bf57b5946f48030a96ae0890e2abe385ee2bffddd984204a2e290ee2c20cf' 
  AND token = 'x3IT+G6BTvDKodBArrUrSJKDfx6GUfJXq6un443qwfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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