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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29d01a2f859f8d01c9745678dd9a9e167e67fef2fec6ef3958a99f13152531c4' 
  AND token = 'RrmNWETkZzK1Xl8LPbSchspuPj8Y60Z38OL5nItr/RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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