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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2241e4ff5f52c64b6b08208f7cba28f94bd3e6534a6315e7cccaf201175a035' 
  AND token = '8ewoSZlIBdwcBcvB78MoqrAaQAJhHsR2lZ6ktnwzXaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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