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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64a6e40ce1f3366a15e560b5c3400d67468a0edfa67ec07507a6d1eaffab8e2e' 
  AND token = 'Eu9jfcVeOy9A/qzi37+Lot008+xutYUw+svpv999DQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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