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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c01525e6976fc0dbf3fc95d1ffb73619a04ace9f69dd46118ef0a68c3b6e74a' 
  AND token = 'YZt+7j4/THlbwk3wxc8oOTTVmSxZBEdVaPzGfG1oG+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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