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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdfb48c89ae58ea06e0e218382e67054389e5e4ebb91ad3b88422b2f007cfbc0' 
  AND token = 'C28IFjy/4T+WlWezt0iahR0rzXSfcM2J7ZoyXlnKUvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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