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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe02002108d40f965af7799720924ae03a90a189a77b1e0d96bd87c15bebdc0' 
  AND token = 'jHS4ueh7HnQqWqJ+MU/YrDvswLXqHZwXW1iY6Obkd8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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