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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36b28abd28c7235d9dd5e4123a1b0a5bbfb3acbaa934b8b40384bc45a8a24169' 
  AND token = '6j8RXxhq9hNAFfwdHvl2J2TH/6PuguHIbysuunME+g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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