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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6168d5dab691adb9f74642d927f65ac07634097ac06d73b88884cb2f2d383f8' 
  AND token = 'mKkycndq44RONSYx/zkmpuuYCYm6G+DU+XkE6kLBNYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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