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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6869b9a24ce7695b31b480ccddd9f4fa0db0b812de26dfdd9d3b677b81a9aa0' 
  AND token = 'Dk2U1k5BhrgfMjzeUBKYVzLXDg7PmVObSx9SkfjZBkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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