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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '171a7e2e10bbd6aea431e30036203494ce77a44dfeb7e054153468786616bdda' 
  AND token = '7cEi1WWV1qYSxR5x2hY+yBVGFlCIM99Yor8m+98T7dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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