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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de9cbe7512143e53ce721ff71fd1d453fabc31210e5ff20cc887be92c6e2d66b' 
  AND token = '9t3NuxXMt61L9E7jgLDb8dPivX22/wmWvdI0IXqY+HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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