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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dfd282c244f78649104ec81903b8a848ea2e97469e930fc2b345b5ee99d0493' 
  AND token = 'asaiEFQ9TNNFQxzK7S8B24knk+U1DYWmVI0IB0vNayY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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