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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '790140acfc189a57f21568968223a71e5f882bee010a86961b5074430ba6261c' 
  AND token = '05ex8c088sOz2eKxq9jGk8CZob4RvPRYgxSmLA5X+Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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