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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d6d5cfe4e6975a4e654282c8b2df03e3fbc8bca1eff7e6eb0e12b3863b91af6' 
  AND token = 'e0lj3ukszgEd3Pcj8tvTaDOj3gNIE4TI8UWdLEFVFDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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