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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '947e60ad4b07678be90f5e714b2ba088442b020ea6983424a7fb0d97d56f9ce4' 
  AND token = 'vydmdLRVLTAdl02//2WbWk+MZPoIDlFtogwXeUikDaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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