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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd050326f6512d133c86edc5a0565fea673b93d2c9768ccc6e73c3ec8dda74ec6' 
  AND token = 'jSH6unbwqrPBm5j/Ysy2VHinqmW/WUcXkul4UHWu5yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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