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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe0928999a21632dcf3eea7a106e27e0e4bf2629a6186c29f2ae852002bb482b' 
  AND token = 'isB205nuxNjv+pvyDe0THK3pOsDkM5UyeHYgn8K9mGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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