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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c01c00e2ee5bd034b5705d29d4f8d7fc6ddb270776d669cf47050ee7b1b8d74' 
  AND token = 'Kb5Xuo4EP6YYb1keWs6+V4CHKsslxrVGEaqf3spYFvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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