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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3017f7193943f00f0c80f5161a83a78e8cf0964269670e1e0612203dac7a7b2' 
  AND token = '2uSQOXd5v5BJHrFOPtfwnaZ6DuoMhHrAF08l2Rwx3ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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