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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38e869e2f08c091ae3fa561d1726d766a5d0297fefb417df4852d5bb5c3928b9' 
  AND token = 'o6mPOn4xSWq1QStgXuv0n9odYje3Xk32U1IM9SOXsGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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