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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c39d2884540d6bdd638afda54fde3d4042a8935dfb43a035c47fc66cf82048a7' 
  AND token = 'jHZkr9mO9VQi4oopm+qidMtmh4ZtH6e+OY7JC1zMOjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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