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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82218061f32e6c7e592b278950f2f0e47df189805883877eb46d1a04a40995df' 
  AND token = 'fkSwQrT+7OJ2CDeJLufW1xl/e1yo9zOv2u91jULYQRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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