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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d3cf617231712730ce5260ba04679dff4286f2815fa22be0ea630f276410bb' 
  AND token = 'OSUz+MMC5bFavxrA7iu3jeZOI9m2aKU2EPyM93Bvvh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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