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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b25c9954f833ba7c696008c0e4ac61d01629cb46284803eeeeaff8947f51ae06' 
  AND token = 'X+llJx11UnGA2QSkRaWqapRxVco8p3ZbC+uf6c66lkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00103

JSON explain

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