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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f96d0c64f1e78e913338e2c2cb93d4766e7b31dd4e77f4712592f0686c043bf' 
  AND token = '4R7ygsFe1fyuwpZt14OR03u1hiOKVlIPTrFCldd+9PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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