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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '445093074223929c445a08f4f66dc5243e460524322347203a1092ada5eb7984' 
  AND token = 't6WLBLQhYz/1T+l6If51N4a0dKtlfyz3ODvJvt8XC1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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