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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc1dc333a7905f6bccb538c1eb8cbc4ca648235b3d2c5c7f18443b26bc5c160' 
  AND token = 'e58/7kAnRVeN8GQ5ACfEW7fifDO0I84Qs4yV40l146s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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