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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a74a0a8d0a3210077b1a884a0715d24b06b3b94ec2f64530c037f98b86556e1b' 
  AND token = '0Yv8XXYUdGNO6Syb51B3pOjN3onfPZmQfMbhfjGzcW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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