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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caae81fe26e600d26ddb5830df9c6b48494aaf2e6ba9c99e50f9ce85edd4c39c' 
  AND token = '3bad8pMpsSfulN2BvC5ozXYhMQXcQjQ4+Z4AO0Q2NT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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