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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd09e5a9ac43f7a23eaac4bf564a5fb110c7ce67e857ccdbe930d94a12ed0d98c' 
  AND token = '+GGP6TS7Zd3f0pDoD2faIFxzupMdUYshrIaOwmoytDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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