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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73f43b3bff6088ff127aa30fe39fccb0f67d6f07eb19e7d8a1ecd639df6b8a1a' 
  AND token = 'cEzW0L1m6Pm6iW5pFwtt2RIhw5EvZ5ANyIBGzJXQReI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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