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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6534a4d09653527aa875e7c203e02b38b2b62d55db4cfaa6279487bd2c477b31' 
  AND token = 'rX8zPBbVv8bSvAYH5O3h0b4/zt2TAOOnxBzJetPAG9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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