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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8c1a64f6dfd29edc23713f6b6631f86d818c8c71357dfeabf1e0605743f937a' 
  AND token = 'XfPpOcNsLXjM9LFHw0RRHP7axBs9pJDCb9OU1LIoYbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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