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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb9118e25c7bbb0e8332db33da83f7bf4704f3404adbb5797de1728f0ec25abb' 
  AND token = 'nQyB40QcDKetfJENXxgc9y8cci4ya6EwuqDo/hEWktc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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