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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a16dc5d602914c6085580c26c7acdea1f6f9edfd37a82205c4ddd07a05cdd958' 
  AND token = 'rkb+UA41NW7AYuqdrP0WEkGarv7K+ftRg27SHCCVarE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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