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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8676d2293e0355c557885aa8ac89c54254957b685edeb077b0209323eab555b5' 
  AND token = '4U5KfANhpWtbsv7atcMRHc42DhkL1NlFm/PMf0Sb/wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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