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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a6cc74ca55c961a240ce7c3385f850e595c66c7322611eae2902602c442c15b' 
  AND token = 'a8LhNR/StRa0cO+ejxsNOuZfvga86NI8KDvj//UO78g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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