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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e674316eee41daa80cf35a8ce6d5a733638fcedde5fe06081a26e6d679a235b' 
  AND token = 't+cL0Zw+Mt78y1Q9PyuVh3+IrErg0n6G4pDXJGPUTjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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