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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03de99a6753954e28d2e42e00c0e23fddc22035b686dc6aadb484ddde32102c3' 
  AND token = 'U0wRwP0CoNgqfoqlVGEGobHWyseqgmkfbkNZrF5mJnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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