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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cde8f63ca6bc8b9b2cdd954b0e3000daa77a6b0917c9d69616750a8913df0cd4' 
  AND token = 'Pr2wn6006NmKTx5+iP1ITdpDUyca3U1dcePg9xZty9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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