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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58ae975c9d3f277fa234d11a9bd5b3fbe7c6f2858497993397df4460cb168a2c' 
  AND token = '1HoOgNKBUZ2ZKveMv3vnSHIHv0fia8Xw90DIWahkwHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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