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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '842c8d1b422e6fdb434bbd53c749214562e23decaa064920e817c45220e64071' 
  AND token = 'TNRRa1GKuMwVu3/eXXfjTx7PrJf9opuhq7m5RYVRGGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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