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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a8d8c5dce3a8545f17809918c6a0e531c795deb5713760003bb50ff25b6c028' 
  AND token = 'XHfvrZ8m3Swj3dz5xi5dx92mK1uGsGabtSaq9llIWhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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